Glazing unit having a metal-based coating and a protective layer at the margin

A glazing unit comprising:

• a first pane and a second pane, which are connected to one another via a thermoplastic intermediate layer,
• a metal-based functional layer, which is deposited on an internal surface of the first pane facing the thermoplastic intermediate layer,
• a coating-free marginal region on the internal surface of the first pane, which is free of metal-based functional layer and extends from one side edge of the first pane over at least 1 mm to at most 5 mm on the internal surface, and
• a protective layer, which, in the coating-free marginal region, is disposed on the internal surface of the first pane and, in an overlap region directly adjoining the coating-free marginal region, is disposed on the metal-based functional layer,
• wherein the protective layer is a transparent oxide-containing coating.